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Old May 15, 2010, 1:30 PM   #31
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The 1.8 will still out perform the 2.8 in low light, it just has a larger aperture. So more light gets in. And you are really not increasing the shutter speed with IS, so exposure really do not change. So in low light the 1.8 still will do better. All the IS does is cut shake at 2.8, so if your shake limit is at 1/30 of a sec. You will be able to hold for a shot that is 1/20-1/25 of a sec with the IS. Exposure does not change.
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Old May 15, 2010, 4:15 PM   #32
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50mm 1/320

17-55mm 1/320
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Old May 15, 2010, 5:12 PM   #33
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what is your fstop on both shots? 1/320 that is pretty fast shutter speed, and very good for avoiding camera shake.
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Old May 15, 2010, 10:56 PM   #34
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Quote:
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what is your fstop on both shots? 1/320 that is pretty fast shutter speed, and very good for avoiding camera shake.
Camera selected 2 for the 50mm and it was 2.8 for the 17-55 but the 50mm was ISO 1600 and the 17-55 was ISO 3200 that was the difference...the 17-55 was sharper with more noise and the 50mm you could tell I got a little shake into the camera...they both turned out decent for low lighting and no flash...I'll stck up a couple tomorrow of the same with the flash bounced and see how the camera responds...
that 17-55 is sharp and the USM IS really helps it...gives some food for thought...like I said I am still learning a lot!

The reason I chose 1/320 was it would probably freeze the motion of a walking toddler...

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Old May 15, 2010, 11:11 PM   #35
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Actually I expect the 50mm 1.8 not to be as sharp, it really does not get sharp till about 4-4.5

Yes the USM is very nice. I won't buy none USM lenses anymore

I would set both camera to 4.5-5.6 if you want to add sharpness to the question.

But for low light testing, I would drop the lighting even more for hand held. Something in the shutter range of 1/30 and below to see how 2.8 compares against 1.8 in that lighting. The IS should get you close.
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Old May 15, 2010, 11:35 PM   #36
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Actually I expect the 50mm 1.8 not to be as sharp, it really does not get sharp till about 4-4.5

Yes the USM is very nice. I won't buy none USM lenses anymore

I would set both camera to 4.5-5.6 if you want to add sharpness to the question.

But for low light testing, I would drop the lighting even more for hand held. Something in the shutter range of 1/30 and below to see how 2.8 compares against 1.8 in that lighting. The IS should get you close.
Will do...if I were going to drop the coin I would definitely opt for the 50mm 1.4 USM to shoot without flash...
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Old May 15, 2010, 11:42 PM   #37
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I love the 50mm 1.4, it is my low light lens of choice.
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